There are many articles about installing wireless cam on
the RC gas helicopter (eg.RC-CAM). It is really very interesting as you can experience
what your helicopter do! However, for an indoor helicopter, the equipment
for such system would be too heavy to be carried for a tiny indoor helicopter.
However, as the development of the technology, the wireless cam that with
transmitter built-in is placed on the market.

The wireless color cam in the above photo is only about 9g
( after the removal of the heavy battery connector ). that's all for me
to put on the helicopter:

I have found several model of these wireless color cam in
the internet. Maybe you would like to take a look:

I finally buy one from a local electronic shop which offer a much more
valuable price. here is what I had bought:

I was so disappointed to realize that the approach of using the same
power source for the helicopter and the cam didn't work. This is because
interference occurred when the tail motor or the main motor starting
turning. However, when
I power the cam with another battery pack and place the cam near the
running motors, the video received remain clear. The problem is how can my tiny
helicopter afford to one more battery pack which is about 100g? the
solution is:

The batteries below the AAA battery pack is the high voltage
alkaline battery ( 12V ). The left one is
GP23A ( E10*28mm ~6g ) while the
right one is
GP27A ( E7.7*28mm
~4g ). Since the power consumption of the wireless cam is only 50mV. It is
possible to power up it by these tiny, light battery. By using this
separated battery, no any interference occurred.

For the sake of weight, wires are directly
soldered on the battery. So, all the components needed to be added on the
helicopter are:

total ~15g

From the above photos, you can see the cam is attached on
the elevator servo. The video captured is not very clear as the platform
for the cam vibrate quite a lot after the helicopter has taken off. The
video has been placed at the
video page which
is only 3.89MB.

This system haven't been tested outdoor cause I got
nothing to capture the video received by the receiver except the video
card on my desktop computer.